Commodore VIC-20 - Page 109

Chapter 3: Programming the VIC 20 Computer 95
50 FOR I-I TO 10
60 FOR X-25 TO 347 STEP 3
·
100 FOR A=9 TO 0 STEP -1
·
140 NEXT A
200 FOR B-25 TO 100 STEP 5
·
280 NEXT B
300 NEXT X
·
500 FOR Y=l TO 20 STEP 2
·
600 FOR P=10 TO 20
·
650 NEXT P
700 NEXT Y
1000 FO~ 2=1 TO 10
·
1090 NEXT 2
1200 NEXT I
The outermost loop uses index I; it contains three nested loops that use
indexes X,
Y, and Z. The first loop contains two additional loops which use
indexes A
and B. The second loop contains one nested loop using index P.
The third loop contains no nested loops. Each nested loop must have a dif-
ferent index variable name. Statement execution sequences may be illus-
trated as follows:
TO lee STEP !5